I remember reading a story set in the late 19th century, where a person said they had wires in their walls but not for electricity. Was there any wire found near these pulleys? We think of houses with servants, where there were call bells that rang in the kitchen, but it may have been for the front door too. Or back door, ringing a different bell. I have helped out in a local museum, a large 1905 house, that had a bell system in the kitchen. It actually looks like a wall clock, but the hand on the face points to the room the bell was rung in. Lots of wires in those walls, imagine the pulley system that enabled it to go round corners. Wires or heavy cords, and you found them in several homes? This could be it.